Chess. A particular sequence of moves at the beginning of a game.

Sport and Games (esp. Chess and Bridge). The final stages or phase of a game, when there are only a few pieces or cards remaining or a conclusion…

Chess. The process of bringing one’s pieces into play during the opening phase of a game, or the speed or effectiveness with which a player does…

the central phase of a chess game when strategies are developed; the part of the game between the opening and the endgame; frequently attributive.